忘记mysql登录密码解决办法

非原创,原文转载自: http://snowolf.iteye.com/blog/1625674

要修改MySQL的root密码，有两个先决条件：
•有修改MySQL配置文件的权限
•有重启MySQL服务的权限

先修改配置文件：

# vim /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1

# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

在[mysqld]下增加skip-grant-tables，即跳过权限验证。

然后登录MySQL，修改root密码：
# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.0.95 Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> update user SET Password = password('<Your Password>') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3  Changed: 3  Warnings: 0

mysql> flush privileges ;
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye

然后把刚才修改的配置文件再改回来，最后重启服务：

# service mysqld restart
停止 MySQL：                                               [确定]
启动 MySQL：                                               [确定]